Can't resolve external domain in-home
reddit / selfhosted

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BeowolfSchaefer · 2023-09-30 00:21

I have a .com domain I purchased which points to my home network. I
can access my services from outside the home network via the domain
name but inside I need to use the IP address. What do I need to do?

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Clarksonator · 2023-09-30 00:51

In my case it is due to some routing issue where you cannot get to
your public IP from behind the router. I added my external domains to
my internal DNS with internal IPs.

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RuaidhriM · 2023-09-30 00:53

You could set up PiHole as your DNS server.

Or add an entry to /etc/hosts

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thekrautboy · 2023-09-30 00:55

This is asked like once a week here, why can apparently nobody simply
use the search before asking...

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Don_Mono · 2023-09-30 00:58

Easy way: Edit your host file and point your DOMAIN.COM to YOUR-
SERVICE-IP.

A slightly more complex solution is to set up a local DNS server and
point your DOMAIN.com to YOUR-SERVICE-IP.

As you can see, both solutions are essentially the same. The only
difference is that if you go the DNS way, you'll be able to access
your services from any device within your local network.

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BeowolfSchaefer · 2023-09-30 01:03

That's what I thought. I guess I'll set up my own DNS server.  Thanks
for confirming.

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No_Dragonfruit_5882 · 2023-09-30 02:11

Calm down bro and drink some beer.

Its your fault anyways, why do you still use your brain while 90% of
the people dont.

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BeowolfSchaefer · 2023-09-30 03:06

I've been thinking of a PiHole anyway. Thanks

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ButCaptainThatsMYRum · 2023-09-30 03:13

Google "NAT reflection".

Its far more likely your terminology is wrong and it IS resolving but
being blocked by your firewall rather than not resolving when you have
an external domain.

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craig91 · 2023-09-30 04:18

Adguard home another option

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cameos · 2023-09-30 04:23

If your router supports NAT loopback, enable it, otherwise, you'll
need to resolve the domain name to your local IP.

What is NAT loopback?

[https://community.tp-
link.com/en/home/stories/detail/1726](https://community.tp-
link.com/en/home/stories/detail/1726)

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nik_h_75 · 2023-09-30 04:46

A much simpler solution is to use cytopia-bind.

You can define wildcard dns rules and forward all other traffic to
regular DNS (like Google).

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kon_dev · 2023-09-30 05:14

Before I used Pihole for my internal DNS, I had that issue before.
Check if your router uses a DNS rebind protection, it blocked any
request which resolved external DNS entries to local IPs.

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certuna · 2023-09-30 07:39

The issue is with NAT hairpin/loopback: the router basically has to
support an internal device going to the external address and then back
in again.

Solution can be:
- use IPv6 (AAAA records), problem doesn’t exist there
- if the router has an explicit option for NAT loopback, enable that
- local DNS server that instead of the public address, resolves the
hostname to the internal address
- hardcoded hostnames in the /hosts file

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dereksalem · 2023-09-30 13:29

Some ISPs will call it Hairpin NAT too. Some ISPs actively reject
it…which is annoying.

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krriisshh · 2023-10-02 02:01

I too had this same issue it turns out the router provided by ISP is
having a DNS management for internal routing. Login to your router
config and search for DNS or DNS management and add the domain name
and which internal IP it needs to be routed to and it should work. It
is annoying to add for all sub domains but this is what that works for
me.